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Publication numberUS1955898 A
Publication typeGrant
Publication dateApr 24, 1934
Filing dateAug 1, 1932
Priority dateAug 4, 1931
Publication numberUS 1955898 A, US 1955898A, US-A-1955898, US1955898 A, US1955898A
InventorsAlfred Frohlich, Bruno Wendt
Original AssigneeAgfa Ansco Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Sensitizing of bleaching-out layers
US 1955898 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Patented Apr. 24, 1934 UNITED STATES SENSITIZING OF BLEAOHING-OUT LAYERS I Bruno Wendt and Alfred Friihlich, Deccan in Anhalt, Germany, assignors to Agfa Ansco Corporation, Binghamton, N. Y., a corporation of New York No lirawing. Application August 1, 1932, Serial No. 627,220. In Germany August 4, 1931 Claims.

Our present invention relates to sensitizing colloid layers containing bleaching-out dyes.

One of its objects is to incorporate the sensitizer in the finished bleaching-out dye layer.

5 Other objects are the different methods of incorporating the sensitizer in the finished bleachingout dye layer. Further objects will be seen from the detailed specification following hereafter.

We have found that it is most convenient to lo incorporate an organic sensitizer, for instance, thiosinamine in the finished bleaching-out dye layer before the same is used. By incorporating the sensitizer only at this stage, the stability of these layers is considerably increased. The incorporation of the sensitizer may occur in various manners. For instance, a solution of the sensitizer may be applied to the colloid layer consisting, for instance, of gelatin or a cellulose derivative and containing the bleaching-out dyes, by

means of rollers wetted with the solution in any suitable manner, or the solution may be applied by spraying the bleaching-out layer either with the solution itself or with the solution in admixture with a colloid.

In order to avoid a wet treatment, the sensitizer may be applied to the layer in the form of vapour in which case, the vapour of sensitizer may be produced in a closed vessel in the presence or absence of other volatile substances, if required under a reduced pressure and while heating.

It is also possible to allow the sensitizer to diffuse from a suitable carrier into a bleachingout layer. The diffusion occurs without aid or is helped by gentle heating (ironing) or by moistening. As a carrier for the sensitizer there may be used paper or a colloid layer (a sheet of gelatin, regenerated cellulose, cellulose esters, cellulose ethers, etc). The carrier is impregnated with a solution of the sensitizer, or the sensitizer is incorporated in the carrier already during its manufacture, by adding it, for instance, to the gelatin solution or the solution of a cellulose derivative before being poured on the support to form a sheet. Such a colloid layer containing the sensitizer may if desired be applied to any suitable base. Whcn the colloid layer provided with the sensitizer is brought into contact with the bleaching-out layer the sensitizer diffuses into the bleaching-out layer under the conditions above mentioned. After the sensitizer has diffused into the bleaching-out layer, thepressed-on carrier for the sensitizer can be detached, or if it consists of a transparent material, it may remain on the bleaching-out layer during the printing process.

The process according to this invention may also be used for the manufacture of sensitized bleaching-out layers on a commercial scale by first preparing non-sensitized layers which are stored in this state. correspondingly with demand of sale, the stored non-sensitized layers are provided in known manner by any of the usual coating machines or by means of a spraying device with the colloid coating. (gelatin or a cellue lose derivative), which contains the quantity required of sensitizer. 85

The following examples illustrate the invention.

Example 1.Diethylallylthiourea and twice its weight of alcohol are evaporated in a closed otherwise evacuated chamber, preferably by gently heating, in thepresence of a bleaching-out layer, for instance, a colloid layer consisting of 30 per cent of collodion and '10 per cent of ethylbenzylcellulose containing bleaching-out dyes and applied to a paper support. The bleaching-out layers are left therein (for about 10 minutes), un til the degree of sensitizing desired is attained.

Example 2.-A solution of 0.8 gram of nitrocellulose and 1.0 gram of pyperidylallylthlourea in 75 cc. of a mixture of 1 part of alcohol and 3 parts of ether is poured on 800 square centimeters of Cellophane (registered trade-mark) or pergamyn. The sheet is pressed on a non-sensitized bleaching-out layer as indicated in Example 1 be-. tween heated rollers or by means of a-fiatiron. After a short time the sensitizer is uniformly distributed in the bleaching-out layer and the sensitizing sheet, whereupon the latter is detached from the bleaching-out layer;

Example 3.A solution of 5 grams of allylthiourea, 100 cc. of water and 8 grams of gelatin is poured so as to form a layer 10 a thick onto a bleaching-outlayer comprising gelatin as binding agent.

Example 4.A solution consisting of 2 grams of dimethylallylthiourea, 1.5 gram of ethylbenzylcellulose, 0.5 gram of nitrocellulose, 20 cc. of ether, 40 cc. of alcohol and 40 cc. of benzene is sprayed onto a bleaching-out layer according to Example 1 by means of a spraying gun. After drying the bleaching-out layer is ready for use.

What we claim is:

1. In sensitizing bleaching-out layers the step which comprises incorporating the sensitizer in the finished bleaching-out layer by applying to the bleaching-out layer a colloid layer containing the sensitizer.

2. The process of sensitizing finished bleaching-out layers which comprises bringing a bleaching-out layer into contact with a colloid layer 4. In sensitizing bleaching-out layers the step which comprises pouring a. solution of colloid and sensitizer onto a non-sensitized bleaching-out layer.

5. In sensitizing bleaching-out layers the step 'which comprises pouring a solution of ellylthiourea' and gelatin in water on to a non-sensitized bleaching-out layer comprising gelatin as binding agent.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3201250 *Jan 12, 1959Aug 17, 1965Eastman Kodak CoDimensionally stable gelatincontaining film product
US3892569 *Dec 4, 1972Jul 1, 1975Gen Film Dev CorpPhotosensitive sheets comprising organic dyes and sensitizers
US5616443 *Jun 1, 1995Apr 1, 1997Kimberly-Clark CorporationToner for electrography
US5643356 *Jun 5, 1995Jul 1, 1997Kimberly-Clark CorporationUnsaturated ketone sensitizer bonded to radiation transorber with color, molecular includent and vehicles
US5643701 *Jun 1, 1995Jul 1, 1997Kimberly-Clark CorporationElectrophotgraphic process utilizing mutable colored composition
US5645964 *Jun 5, 1995Jul 8, 1997Kimberly-Clark CorporationStabilizers
US5681380 *Dec 19, 1996Oct 28, 1997Kimberly-Clark Worldwide, Inc.Ink for ink jet printers
US5683843 *Feb 22, 1995Nov 4, 1997Kimberly-Clark CorporationSolid colored composition mutable by ultraviolet radiation
US5685754 *May 19, 1995Nov 11, 1997Kimberly-Clark CorporationMethod of generating a reactive species and polymer coating applications therefor
US5686503 *Jan 22, 1996Nov 11, 1997Kimberly-Clark CorporationPhotoinitiators
US5700850 *Jun 5, 1995Dec 23, 1997Kimberly-Clark WorldwidePhotostability; colorant and radiation absorber
US5709955 *Oct 16, 1996Jan 20, 1998Kimberly-Clark CorporationLamination, photoreactor with wavelength-specific sensitizer bonded to photoinitiator
US5721287 *Jun 5, 1995Feb 24, 1998Kimberly-Clark Worldwide, Inc.Radiating in presence of transorber
US5733693 *Jan 2, 1997Mar 31, 1998Kimberly-Clark Worldwide, Inc.Method for improving the readability of data processing forms
US5739175 *Jun 5, 1995Apr 14, 1998Kimberly-Clark Worldwide, Inc.Photoreactor composition containing an arylketoalkene wavelength-specific sensitizer
US5747550 *Jun 5, 1995May 5, 1998Kimberly-Clark Worldwide, Inc.Method of generating a reactive species and polymerizing an unsaturated polymerizable material
US5773182 *Jun 5, 1995Jun 30, 1998Kimberly-Clark Worldwide, Inc.Method of light stabilizing a colorant
US5782963 *Nov 27, 1996Jul 21, 1998Kimberly-Clark Worldwide, Inc.Colorant stabilizers
US5786132 *May 29, 1996Jul 28, 1998Kimberly-Clark CorporationPre-dyes, mutable dye compositions, and methods of developing a color
US5798015 *Jun 5, 1995Aug 25, 1998Kimberly-Clark Worldwide, Inc.Exposing a photoreactor composition to radiation in which the photoreactor composition comprises a wavelength-specific sensitizer associated with a reactive-species generating photoinitiator
US5811199 *Jun 5, 1995Sep 22, 1998Kimberly-Clark Worldwide, Inc.Exposing photoreactor to radiation; photoreactor comprises wavelength specific sensitizer
US5837429 *Jun 5, 1996Nov 17, 1998Kimberly-Clark WorldwideDye covalently bound to radiation transorber that is colorless and will form color when irradiated
US5849411 *Jun 5, 1995Dec 15, 1998Kimberly-Clark Worldwide, Inc.Polymer film, nonwoven web and fibers containing a photoreactor composition
US5855655 *Apr 15, 1997Jan 5, 1999Kimberly-Clark Worldwide, Inc.Colorant stabilizers
US5858586 *May 16, 1997Jan 12, 1999Kimberly-Clark CorporationDigital information recording media and method of using same
US5865471 *Dec 21, 1994Feb 2, 1999Kimberly-Clark Worldwide, Inc.For use with photo-sensing apparatus
US5885337 *Oct 31, 1997Mar 23, 1999Nohr; Ronald SinclairComprising a reducing agent and/or a molecular inclusion compound for inhibiting discoloration when exposed to sunlight or artificial light
US5891229 *Jul 31, 1997Apr 6, 1999Kimberly-Clark Worldwide, Inc.Colorant stabilizers
US5908495 *Sep 24, 1997Jun 1, 1999Nohr; Ronald SinclairColorant; a modified photoreactor; and a liquid vehicle wherein the colorant is rendered light-stable in the mixture
US6008268 *Jan 22, 1998Dec 28, 1999Kimberly-Clark Worldwide, Inc.A photoreactor compound comprising a wavelength-specific sensitizer moiety covalently bonded to two reactive species-generating photoinitiator moieties; photopolymerization; photocuring; low-energy lamps
US6017471 *Apr 23, 1997Jan 25, 2000Kimberly-Clark Worldwide, Inc.Colorants and colorant modifiers
US6017661 *Oct 8, 1997Jan 25, 2000Kimberly-Clark CorporationSubstrate surface attached to merchandise and labeled with indicia comprising a mutable colorant, molecular includant and a transorber which irreversibly decolors colorant upon exposure to ultraviolet radiation
US6033465 *Apr 5, 1996Mar 7, 2000Kimberly-Clark Worldwide, Inc.Colorants and colorant modifiers
US6054256 *Dec 3, 1998Apr 25, 2000Kimberly-Clark Worldwide, Inc.Colorimetric analysis; detecting dosage radiation
US6060200 *Feb 3, 1998May 9, 2000Kimberly-Clark Worldwide, Inc.Photo-erasable data processing forms and methods
US6060223 *Dec 3, 1998May 9, 2000Kimberly-Clark Worldwide, Inc.Plastic article for colored printing and method for printing on a colored plastic article
US6063551 *Nov 16, 1998May 16, 2000Kimberly-Clark Worldwide, Inc.A leuco dye associated with a radiation transorber where the radiation transorber comprises a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor; phthaloylglycine; 4-(4-hydroxyphenyl)but-2-one
US6066439 *Dec 3, 1998May 23, 2000Kimberly-Clark Worldwide, Inc.Instrument for photoerasable marking
US6071979 *Dec 26, 1997Jun 6, 2000Kimberly-Clark Worldwide, Inc.To generate photoinitiators for polymerizing unsaturated monomers and curing an unsaturated oligomer/monomer mixture
US6090236 *Dec 31, 1997Jul 18, 2000Kimberly-Clark Worldwide, Inc.Photocuring, articles made by photocuring, and compositions for use in photocuring
US6099628 *Jan 23, 1997Aug 8, 2000Kimberly-Clark Worldwide, Inc.Colorant stabilizers
US6120949 *Dec 3, 1998Sep 19, 2000Kimberly-Clark Worldwide, Inc.A temporary markings comprising a colorant, a mutable colorant and an ultraviolet radiation transorber, when irradiating with ultraviolet radiation, and changing the colorant to colorless
US6127073 *Dec 3, 1998Oct 3, 2000Kimberly-Clark Worldwide, Inc.Method for concealing information and document for securely communicating concealed information
US6168654Apr 6, 1999Jan 2, 2001Kimberly-Clark Worldwide, Inc.Porphine imparts light-stability to the colorant so that the colorant does not fade
US6168655Dec 15, 1998Jan 2, 2001Kimberly-Clark Worldwide, Inc.Phenol derivatives
US6211383Feb 10, 1998Apr 3, 2001Kimberly-Clark Worldwide, Inc.Reacting the compound in a non-aqueous non-polar solvent in the presence of a transition metal salt such that the hydroxy group is dehydrated
US6228157Jul 20, 1999May 8, 2001Ronald S. NohrInk jet ink compositions
US6235095Jun 1, 1999May 22, 2001Ronald Sinclair NohrInk for inkjet printers
US6242057Apr 29, 1998Jun 5, 2001Kimberly-Clark Worldwide, Inc.Photoreactor composition and applications therefor
US6265458Sep 28, 1999Jul 24, 2001Kimberly-Clark Worldwide, Inc.Photoinitiators and applications therefor
US6277897Jun 3, 1999Aug 21, 2001Kimberly-Clark Worldwide, Inc.Photoinitiators and applications therefor
US6294698 *Apr 16, 1999Sep 25, 2001Kimberly-Clark Worldwide, Inc.Photoinitiators and applications therefor
US6331056Feb 24, 2000Dec 18, 2001Kimberly-Clark Worldwide, Inc.Printing apparatus and applications therefor
US6342305Dec 28, 1999Jan 29, 2002Kimberly-Clark CorporationColorants and colorant modifiers
US6368395May 12, 2000Apr 9, 2002Kimberly-Clark Worldwide, Inc.Colorfastness; photostability
US6368396Jan 19, 2000Apr 9, 2002Kimberly-Clark Worldwide, Inc.Colorants, colorant stabilizers, ink compositions, and improved methods of making the same
US6486227Jun 19, 2001Nov 26, 2002Kimberly-Clark Worldwide, Inc.Zinc-complex photoinitiators and applications therefor
US6503559Jun 3, 1999Jan 7, 2003Kimberly-Clark Worldwide, Inc.Neonanoplasts and microemulsion technology for inks and ink jet printing
US6524379Jan 12, 2001Feb 25, 2003Kimberly-Clark Worldwide, Inc.Colorants, colorant stabilizers, ink compositions, and improved methods of making the same
U.S. Classification430/339
International ClassificationG03C7/02
Cooperative ClassificationG03C7/02
European ClassificationG03C7/02